Electronic equipment

ABSTRACT

The electronic equipment includes a housing accommodating an electronic circuit used in the operation of the device and a high-frequency circuit for wireless communication related to the operation of the device. A dielectric antenna is mounted on the rear surface of the housing near a lateral end thereof. Since the electronic circuit for operation and the high-frequency circuit for wireless communication are provided in the housing, it is not necessary to connect a personal computer and a mobile telephone by a cable thus making the device mobile. Further, since the dielectric antenna connected to the high-frequency circuit is mounted on the rear surface of the housing, the antenna characteristics can be improved and stabilized.

This application is a Divisional Application of U.S. application Ser.No. 09/813,145, filed Mar. 21, 2001, now U.S. Pat. No. 6,775,133.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates generally to electronic equipment such asan information processing device, and more particularly to electronicequipment (portable information equipment) such as a personal computersuitable for use as a mobile (movable) terminal.

2. Description of the Related Art

In recent years, a personal computer designed for personal use hasbecome widespread. By connecting a personal computer to the Internet viaa public line and a commercial provider (line connection organization),information retrieval and electronic mail exchange can be easily made.

On the other hand, a display (e.g., liquid crystal display) suitable forhigh-density integration and thinning of an electronic circuit has beenput to practical use, and in association therewith various laptop,notebook, and any other portable personal computers are currently on themarket. By connecting a portable personal computer to a public linethrough a wireless communication tool such as a mobile telephone and aPHS, the portable personal computer can be used as a so-called mobileterminal.

In the case of connecting a portable personal computer through a mobiletelephone, for example, to a public line, it is necessary to connect thepersonal computer and the mobile telephone by a cable according topredetermined specifications prior to operating the mobile telephone.Accordingly, it is troublesome to use the personal computer as a mobileterminal.

It is therefore an object of the present invention to provide electronicequipment such as a personal computer which can be easily used as amobile terminal.

The other objects of the present invention will become apparent from thefollowing description.

SUMMARY OF THE INVENTION

According to the present invention, the function of a mobile telephoneor a PHS for connection to a public line is incorporated in a personalcomputer in order that the personal computer can be easily used as amobile terminal. More generally, there is provided electronic equipmentincorporating a high-frequency circuit for wireless communication.

In the case of performing wireless communication, an antenna connectedto the high-frequency circuit is indispensable. Recently, a dielectricantenna has been put to practical use as an antenna suitable for sizereduction. The dielectric antenna has a surface formed with first andsecond conductor patterns having predetermined shapes. The firstconductor pattern is connected to the high-frequency circuit, and thesecond conductor pattern is grounded to a conductive housing of theelectronic equipment, for example. In this case, the antennacharacteristics tend to change according to the mounting position of thedielectric antenna. Accordingly, in the electronic equipmentincorporating the high-frequency circuit, it has been examined tooptimize the mounting position of the dielectric antenna.

In accordance with a first aspect of the present invention, there isprovided electronic equipment adapted to be operated by an operator infacing positional relationship therewith. This electronic equipmentcomprises a housing accommodating a circuit for wireless communication,and a dielectric antenna connected to the circuit. The dielectricantenna is provided on a rear surface of the housing near a lateral endthereof.

With this arrangement, an electronic circuit for operation and ahigh-frequency circuit for wireless communication can be provided in thehousing. Accordingly, it is not necessary to connect a personal computerand a mobile telephone by a cable according to predeterminedspecifications as in the prior art, so that it is possible to provideelectronic equipment which can be easily used as a mobile terminal.Further, since the dielectric antenna is mounted on the rear surface ofthe housing near a lateral end thereof, the antenna characteristics canbe improved and stabilized.

In accordance with a second aspect of the present invention, there isprovided electronic equipment having a wireless communication function.This electronic equipment comprises a housing accommodating a circuitfor wireless communication and an electronic circuit for operationdifferent from wireless communication, and a switch for controlling theoperation of the circuit for wireless communication independently of theoperation of the electronic circuit.

In accordance with a third aspect of the present invention, there isprovided electronic equipment adapted to be placed on a substantiallyhorizontal surface in use. This electronic equipment comprises a housinghaving a lower surface including an inclined surface inclined withrespect to the substantially horizontal surface, and a plurality of padsmounted on the lower surface of the housing. The inclined surface isformed with a foot portion for mounting each pad so that each pad has auniform thickness.

In accordance with a fourth aspect of the present invention, there isprovided electronic equipment comprising a dielectric antenna having asurface formed with a conductor pattern having a predetermined shape; asubstrate having a first surface and a second surface, the dielectricantenna being mounted on the first surface; and a coaxial connectormounted on the second surface of the substrate. The substrate has aground pattern between the dielectric antenna and said coaxialconnector.

In accordance with a fifth aspect of the present invention, there isprovided electronic equipment comprising a housing having a recess; afunctional module accommodated in the recess; a lid provided on thehousing for covering the functional module, the lid being adapted to beopened/closed or detached/attached; a flexible printed circuit boardinterposed between the functional module and the lid, the flexibleprinted circuit board having one end connected to an electronic circuitprovided in the housing; and a connector mounted to the other end of theflexible printed circuit board for detachably connecting the flexibleprinted circuit board to a side surface of the functional module. Theflexible printed circuit board is introduced from the side opposite tothe lid to the connector.

The above and other objects, features and advantages of the presentinvention and the manner of realizing them will become more apparent,and the invention itself will best be understood from a study of thefollowing description and appended claims with reference to the attacheddrawings showing some preferred embodiments of the invention.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a perspective view showing a preferred embodiment of aninformation processing device as the electronic equipment according tothe present invention as viewed from the front side thereof in a closedcondition;

FIG. 2 is a perspective view of the device as viewed from the rear sidethereof in the closed condition;

FIG. 3 is a perspective view of the device as viewed from the front sidethereof in an open condition;

FIG. 4 is a perspective view of the device as viewed from the rear sidethereof in the open condition;

FIG. 5 is a perspective view of an essential part of a body housing ofthe device;

FIG. 6 is a plan view of the essential part shown in FIG. 5;

FIGS. 7A and 7B are plan views of an antenna assembly and a substrate,respectively, as viewed from the side of a dielectric antenna;

FIGS. 8A and 8B are plan views similar to FIGS. 7A and 7B, respectively,as viewed from the side of a coaxial connector opposite to thedielectric antenna;

FIG. 9 is a block diagram of a high-frequency module;

FIG. 10 is an exploded perspective view of the device as viewed from thebottom rear side thereof;

FIG. 11 is a side view showing the relation between a hard disk driveand an FPC (flexible printed circuit board);

FIG. 12 is a bottom plan view of the body housing; and

FIG. 13 is a cross section taken along the line XIII-XIII in FIG. 12.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

A preferred embodiment of the present invention will now be described indetail with reference to the attached drawings.

FIGS. 1 to 4 are perspective views showing a preferred embodiment of aninformation processing device as the electronic equipment according tothe present invention. This device may be a laptop, notebook, or anyother portable personal computer. This device includes a body housing 2and a subhousing 6 pivotably supported to the body housing 2 by a pairof hinged portions 4. FIGS. 1 and 3 are front perspective views of thedevice as viewed from the front side thereof in relation to theoperation by an operator, and FIGS. 2 and 4 are rear perspective viewsof the device as viewed from the rear side thereof in relation to theoperation by the operator. Further, FIGS. 1 and 2 show a closedcondition of the subhousing 6 with respect to the body housing 2, andFIGS. 3 and 4 show an open condition of the subhousing 6 with respect tothe body housing 2.

As best shown in FIG. 3, the body housing 2 is provided with a keyboardunit 8 for use in data inputting or the like in relation to theoperation, and the subhousing 6 is provided with a display unit 10 foruse in displaying in relation to the operation. The display unit 10includes an LCD (liquid crystal display) panel, for example. A pair ofengaging portions (e.g., holes) 12 are formed at a front end portion ofthe body housing 2, and a pair of hooks 14 adapted to engage theengaging portions 12 are provided on the subhousing 6 at positionscorresponding to the engaging portions 12. The hooks 14 are limitativelymovable by a slider 16 provided at the front end of the subhousing 6opposite to the hinged portions 4, so that the subhousing 6 can belocked in its closed condition with respect to the body housing 2, andthis locked condition of the subhousing 6 can be canceled by operatingthe slider 16.

FIG. 5 is a perspective view of an essential part of the body housing 2as viewed from the rear side thereof, and FIG. 6 is a plan view of thisessential part. An antenna assembly 18 for use in wireless communicationby the connection of this device to a public line, for example, ismounted on the rear surface of the body housing 2 near a lateral endthereof by means of a screw 20. The antenna assembly 18 includes asubstrate 22 and a dielectric antenna 24 surface-mounted on thesubstrate 22. As best shown in FIG. 6, the antenna assembly 18 isconnected through a coaxial cable 26 to a high-frequency module 30accommodated in the body housing 2. A mother board 31 providing anelectronic circuit related to the operation by the use of the keyboardunit 8 (see FIG. 3) or the like is also accommodated in the body housing2.

FIGS. 7A and 8A are plan views of the antenna assembly 18 as viewed fromthe same side as the dielectric antenna 24 and the opposite sidethereof, respectively, and FIGS. 7B and 8B are plan views of thesubstrate 22 respectively corresponding to FIGS. 7A and 8A. Thesubstrate 22 has a first surface 22A and a second surface 22B. Thesecond surface 22B is opposed to the body housing 2. The dielectricantenna 24 and a coaxial connector 34 are fixed by surface mounting tothe first surface 22A and the second surface 22B, respectively. Thecoaxial cable 26 (see FIG. 5) is connected to the coaxial connector 34.

As best shown in FIG. 7A, the dielectric antenna 24 is composed of adielectric chip 35 and first and second conductor patterns 36 and 38formed on the surface of the dielectric chip 35. The first and secondconductor patterns 36 and 38 have predetermined shapes. The firstconductor pattern 36 is soldered at one position to a feeder pattern 44formed on the first surface 22A of the substrate 22, and the secondconductor pattern 38 is soldered at four positions to a ground pattern40 formed on the first surface 22A of the substrate 22.

As best shown in FIG. 8A, the coaxial connector 34 has a signal terminal46 and a ground terminal 48 provided so as to surround the signalterminal 46. The signal terminal 46 is soldered at one position to afeeder pattern 52 formed on the second surface 22B of the substrate 22,and the ground terminal 48 is soldered at two positions to a groundpattern 50 formed on the second surface 22B of the substrate 22. Thecoaxial connector 34 is located at a substantially central position ofthe substrate 22.

The feeder patterns 44 and 52 are connected by a via 54 extendingthrough the substrate 22, and the ground patterns 40 and 50 are alsoconnected by a plurality of vias 56 extending through the substrate 22.Accordingly, the dielectric antenna 24 can be connected to thehigh-frequency module 30 by the coaxial cable 26 connected to thecoaxial connector 34. Further, by forming the body housing 2 from aconductor such as metal (e.g., alloy containing magnesium as a principalcomponent), the second conductor pattern 38 of the dielectric antenna 24can be connected to the body housing 2 only by tightening the screw 20to press the substrate 22 against the body housing 2.

To improve the connection of the second conductor pattern 38 and thebody housing 2, a plurality of (e.g., seven as shown) vias 55 areprovided around a through hole 57 formed through the substrate 22 forinsertion of the screw 20, and solder bumps are formed at the whole or apart (e.g., alternate ones) of the vias 55, thereby improving electricalconnection when tightening the screw 20 to press the substrate 22against the body housing 2. As shown in FIG. 5, the substrate 22 ismounted on a thin-walled or recessed seating portion 69 formed on therear surface of the body housing 2 near its lateral end. The seatingportion 69 is formed with a notch 71 for insertion of the coaxial cable26. As shown in FIG. 2, a cap 28 for covering the antenna assembly 18 ismounted on the body housing 2 for the purposes of protection, goodappearance, etc. The cap 28 is formed by molding of a metal-freematerial such as plastic, so as to suppress an influence on antennagain.

The reason for mounting the antenna assembly 18 on the body housing 2rather than on the subhousing 6 which is easily displaceable is that theantenna characteristics can be stabilized and that the coaxial cable 26can be sufficiently shortened to prevent an increase in loss. Further,the reason for mounting the antenna assembly 18 on the rear surface ofthe body housing 2 is to prevent that the antenna characteristics maybecome unstable because of the influence of the operator and to minimizethe influence of electromagnetic waves radiated from the antenna on thehuman body. For example, in the case that the antenna assembly 18 ismounted on the front surface or side surface of the body housing 2,there is a possibility that the antenna characteristics may varyaccording to the motion of the operator. Further, the reason formounting the antenna assembly 18 near the lateral end on the rearsurface of the body housing 2 is to improve the antenna characteristicsas compared with the case of mounting the antenna assembly 18 at acentral portion on the rear surface of the body housing 2. If theantenna assembly 18 is mounted at the central portion, it has beenconfirmed by experiment that the electric fields induced in the bodyhousing 2 by the dielectric antenna 24 cancel each other to deterioratethe antenna characteristics.

The reason for interposing the substrate 22 between the dielectricantenna 24 and the coaxial connector 34 as shown in FIGS. 7A and 8A isto prevent that variations in relative positional relation between thecoaxial connector 34 and the coaxial cable 26 may have a directinfluence on the antenna characteristics. The coaxial cable 26 is easilyrotationally displaceable relative to the coaxial connector 34.Accordingly, if the dielectric antenna 24 and the coaxial connector 34are provided on the same side with respect to the substrate 22, there isa possibility of changes in electromagnetic characteristics such asimpedance characteristics between the dielectric antenna 24 and the bodyhousing 2. According to this preferred embodiment, the substrate 22 hasthe ground patterns 40 and 50 between the dielectric antenna 24 and thecoaxial connector 34, the above possibility of variations in antennacharacteristics can be eliminated to thereby allow stable wirelesscommunication.

FIG. 9 is a block diagram of the high-frequency module 30. Thehigh-frequency module 30 is provided to be intended to connect thisdevice to a public line, for example, and to provide the function of amobile telephone or a PHS. The high-frequency module 30 has ahigh-frequency circuit 58 connected through the coaxial cable 26 to thedielectric antenna 24. The high-frequency circuit 58 is connected to abaseband circuit 60 to perform transmission and reception of data or thelike. The baseband circuit 60 is connected through a logicaltransformation circuit 62 to a PCI connector (or mini-PCI connector) 64by bidirectional buses. The PCI connector 64 has a plurality ofterminals assigned to interface between the high-frequency module 30 andthe mother board 31. By using at least one of the terminals of the PCIconnector 64, a transmit/receive stop control signal is supplied fromthe mother board 31 through a stop control line SCL to thehigh-frequency circuit 58. Reference numeral 66 denotes a power circuitfor supplying power through the PCI connector 64 to each circuit.

For example, in the case that this device is used in an airplane or ahospital in which the radiation of high-frequency electromagnetic wavesmust be minimized, there is a case that only the function of wirelesscommunication is to be turned off and the other functions are desired tobe kept on. In this preferred embodiment, such a demand is met by usingthe stop control line SCL to temporarily turn off the high-frequencycircuit 58. Such temporary switching on/off of the high-frequencycircuit 58 may be made by switching on/off the power supplied to thehigh-frequency circuit 58 or by switching on/off an oscillator (e.g.,VCO) (not shown) incorporated in the high-frequency circuit 58.

In this preferred embodiment, the transmit/receive stop control signalis generated by a slide switch 68 (see FIG. 1, for example) provided onthe outer surface of the subhousing 6. The slide switch 68 is positionedin the vicinity of the slider 16 for mechanical locking of thesubhousing 6. Thus, by operating the slide switch 68 to generate thetransmit/receive stop control signal, only the function of wirelesscommunication can be temporarily turned off very easily.

In the case of connecting this device to a public line through wirelesscommunication, an electric field strength related to the public line isrequired to be sufficiently large. In this respect, this preferredembodiment employs a circuit for detecting an electric field strength ata position where this device is placed, and an indicator element forindicating the electric field strength detected by this detectingcircuit. The indicator element may be provided by an LED (light emittingdiode) adapted to change the brightness of illumination or the frequencyor intervals of flashing according to the electric field strengthdetected. This LED may be incorporated in the slide switch 68. In thiscase, the slide switch 68 has a transparent or translucent movableportion, and the LED emits visible light through the movable portion.With this arrangement, it can be easily checked whether or not thisdevice can be stably connected to a public line.

FIG. 10 is an exploded perspective view of this device as viewed fromthe rear lower side thereof. A battery pack 67 incorporating a batteryis detachably provided on the front surface of the body housing 2. Thelower surface of the body housing 2 is formed with a recess 2B foraccommodating a hard disk drive 70 as a storage device for a personalcomputer. The hard disk drive 70 is wrapped by a damper 76 andaccommodated in the recess 2B. In this condition, a lid 72 for coveringthe lower surface of the hard disk drive 70 is mounted on the bodyhousing 2. A flexible printed circuit board (FPC) 74 is interposedbetween the hard disk drive 70 and the damper 76, i.e., between the harddisk drive 70 and the lid 72. The hard disk drive 70 is connectedthrough the FPC 74 to the mother board 30 mounted in the body housing 2.The lid 72 is detachably mounted on the body housing 2 by a screw.Alternatively, the lid 72 may be pivotably mounted at its one end to thebody housing 2 so as to be opened and closed.

FIG. 11 is a side view showing the relation between the hard disk drive70 and the FPC 74 shown in FIG. 10. In FIG. 11, an encircled portion isenlarged as depicted by an arrow. The hard disk drive 70 is providedwith a connector 78. The FPC 74 is connected at its longitudinal one endto the connector 78, and the other end of the FPC 74 is connected to themother board 30 (see FIG. 6). The connector 78 is adapted to detachablyconnect the FPC 74 to a side surface of the hard disk drive 70. In thispreferred embodiment, the FPC 74 is introduced from the side opposite tothe lid 72 (located above the hard disk drive 70 as viewed in FIG. 11)to the connector 78. With this arrangement, it is possible to preventthat the connector 78 may be undesirably removed from the hard diskdrive 70 by the detachment/attachment or opening/closing of the lid 72.

In the case of interposing a FPC between a hard disk drive and a lid inthe prior art, it is generally considered that the FPC is introducedfrom the same side as the lid to the connector. In this case, whenclosing the lid to the body housing, the elasticity of an extra-lengthportion of the FPC is exerted in a direction of removing the connectorfrom the hard disk drive. Accordingly, there is a possibility that theconnector may be removed from the hard disk drive after completing themanufacture or modification of the device.

To the contrary, this preferred embodiment can eliminate the aboveproblem. That is, the FPC 74 is introduced from the side opposite to thelid 72 to the connector 78. Therefore, the elasticity of an extra-lengthportion of the FPC 74 is exerted in a direction of pressing theconnector 78 against the hard disk drive 70 by the closing operation ofthe lid 72 with respect to the body housing 2. Accordingly, it ispossible to prevent that the connector 78 may be removed from the harddisk drive 70 after completing the manufacture or modification of thisdevice.

The reason for exchangeability of the hard disk drive 70 with respect tothe body housing 2 is to allow this device to easily supportmodifications related to an increase in storage capacity of a hard diskdrive, for example.

FIG. 12 is a bottom plan view of the essential part of the body housing2, and FIG. 13 is a cross section taken along the line XIII-XIII in FIG.12. This device is designed to be placed on a substantially horizontalsurface 82 in use, and a plurality of pads 80 formed of an elasticmaterial such as rubber are provided on a lower surface 2C of the bodyhousing 2 for the purposes of generating a relatively large frictionalforce between the horizontal surface 82 and the lower surface 2C tothereby suppress the slippage of the device on the horizontal surface 82and also suppressing the transmission of vibrations or the like from thehorizontal surface 82 to the device.

As best shown in FIG. 13, the lower surface 2C of the body housing 2includes an inclined surface IS inclined with respect to the horizontalsurface 82. The inclined surface IS is intended to incline the device asa whole to the operator, thereby improving the operability. Further, theinclined surface IS is formed with foot portions 83 for mounting thepads 80, so as to make the thickness of each pad 80 uniform. Morespecifically, each foot portion 83 of the body housing 2 has a thicknessgradually changing in the longitudinal direction of the body housing 2(in the horizontal direction as viewed in FIG. 13) so that each footportion 83 has a substantially horizontal pad mounting surface 84.

With this arrangement, a plurality of pads having substantially the sameshape can be used as the pads 80, thereby allowing a reduction in kindof parts of the device to largely contribute to a cost reduction.Further, since the thickness of each pad 80 is uniform, it is notnecessary to consider the directionality of the pads 80 in mounting thepads 80 onto the lower surface 2C of the body housing 2, therebyimproving the workability in manufacturing the device.

While the antenna assembly 18 is mounted on the body housing 2 formed ofa conductor such as metal, so as to obtain the ability of the antennaassembly 18 to the maximum in the above preferred embodiment, thepresent invention is not intended to be limited to the above preferredembodiment. For example, the body housing 2 may be formed of aninsulating material such as plastic, and a metallic thin film may beformed on the surface of the body housing 2 by ion plating or vapordeposition. In this case, the ground of the antenna assembly 18 isclosely fitted with the metallic thin film. Alternatively, the ground ofthe antenna assembly 18 may be closely fitted with a metal fitting, andthis metal fitting may be connected to the metallic thin film.

According to the present invention as described above, it is possible toprovide electronic equipment such as a personal computer which can beeasily used as a mobile terminal.

The present invention is not limited to the details of the abovedescribed preferred embodiments. The scope of the invention is definedby the appended claims and all changes and modifications as fall withinthe equivalence of the scope of the claims are therefore to be embracedby the invention.

1. Electronic equipment comprising: a dielectric antenna having asurface formed with a conductor pattern having a predetermined shape; asubstrate having a first surface and a second surface, said dielectricantenna being mounted on said first surface; and a coaxial connectormounted on said second surface of said substrate; said substrate havinga ground pattern between said dielectric antenna and said coaxialconnector, wherein: said ground pattern comprises first and secondground patterns formed on said first and second surfaces of saidsubstrate, respectively; said first and second ground patterns beingconnected by a via extending through said substrate.
 2. Electronicequipment according to claim 1, wherein: said conductor pattern of saiddielectric antenna comprises first and second conductor patterns; saidfirst conductor pattern being connected to said first ground pattern;said coaxial connector comprising a signal terminal and a groundterminal; said ground terminal being connected to said second groundpattern; said second conductor pattern of said dielectric antenna andsaid signal terminal of said coaxial connector being connected by afeeder pattern formed on said substrate.
 3. Electronic equipmentaccording to claim 1, further comprising: a housing on which saidsubstrate is mounted, said housing being formed of a conductor saidsecond ground pattern of said substrate being connected to said housing.